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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '354711a2ca300cffaf39a0c54ab3005c8a51cf12749f50fa33f36557791babca' 
  AND token = 'HGIP3fDiXzRxCWDw3ruauqJbra1XVNWeKwEICYmohLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}